Induction-machine



(No Model.) 2 Sheets-Sheet 1 W. K. FREEMAN.

INDUCTION MACHINE No. 554,670. Patented Feb. 18, 1896.

- fibril, 6 93.

AN DREW HGNAHAM. PHOYO-LITMQWASHINGTON. D C

' (No Model.)

I 2 Sheets-Sheet 2. W. K. FREEMAN. INDUCTION MACHINE N0. 554,670.Patented Feb. 18, 1896.

- & Dam...-

ANDRLW H.0RANAM. PHOTO-UTNO.WASNIN WON. no

UNITED STATES PATENT Orricn- XVALTER K. FREEMAN, OF FORT TVAYNE,INDIANA.

lNDUCTlON -MACHINE.

SPECIFICATION forming part of Letters Patent No. 554,670, dated February18, 1896.

Application filed July 5, 1895. Serial No. 555,054. (1% model.)

To aZZ whom it may concern:

Be it known that I, WALTER K. FREEMAN, of Fort \Vayne, in the county ofAllen, State of Indiana, have invented certain new and usefulImprovements in Induction-Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the same,reference being had to the accompanying drawings, forming a part of thisspecification, and to the letters of reference marked thereon.

This invention relates to improvements in current-generators and motors,the improvements being more especially applicable to consequent-polemachines, and hence a machine of this character has been illustrated.

The invention resides in certain novel details of construction andcombinations and arrangements of parts whereby a compact structure isproduced in which a magnetic circuit is secured with a minimum air-gapbetween the field and armature-core, the lines of force finding a pathof minimum resistance, thereby preventing excessive heating andpermitting the machine to run loaded to any point within the limit ofits capacity.

Referring to the accompanying drawings, Figure 1 is an end elevation ofa machine constructed in accordance with this invention. Fig. 2 is anelevation taken at right angles to Fig. 1 with one of the movablesections of the field swung back. Fig. 3 is a top plan view of theframe. Figs. 4 and 5 are vertical sectional views of the frame, taken atright angles to each other.

Like letters of reference in the several figures indicate the sameparts.

The main frame of the machine is preferably made in an integral castingembodying the base A and the two cheek-pieces or uprights 13, betweenwhich the pole-pieces of the field are located, together with the bodyof the armature, as will presently appear.

One of the poles C, a consequent pole, is usually formed integral withthe base, centrally between the cheek-pieces, and at the ends betweenthe cheek pieces there are formed seats D for the ends of movablefieldsections E, which latter fit quite accurately between thecheek-pieces and are normally clamped in such position by bolts cpassing in through the edges of the said cheek-pieces.

The movable field-pieces E are angular,

both together forming a complete bridge, the line of division betweenthem preferably being centrally of the upper consequent pole F. In otherwords this upper pole is formed half on one field-piece and half on theother. The main or prime pole-pieces G, around which the field-coils Gare placed, project from the inner faces of the upright portions of thefieldpiecesat diametrically-opposite points.

Clamping-bolts E, at the lower ends of the movable field pieces, areadapted to form pivots on which the field-pieces may be turn ed out tothe position shown on the left in Fig.

2, thus opening the machine for inspection or repairs and permitting theconvenient removal or renewal of the field-coils. WV hen thefield-pieces are turned back, as indicated, the whole armature isexposed between the cheek-pieces, and, if desired, maybe removed in theordinary manner@'. a. by releasing its shaft from the bearings, one ofwhich, K, is mounted on one of the cheelcpieces and the other of whichis on a standard L on the base, sufficiently removed from thecheek-pieces to allow for the location of a commutator M next to thebody of the machine.

The commutator-brushes N are preferably supported by thebearing-standard; but the form of brush employed is inconsequential, andhence no particular description of the same is necessary.

To facilitate the insertion and removal of the armature, as well as tosecure a more perfect concentration of the lines of force,'

the cheek-pieces are formed with circular openings Q of a size to allowthe armature to pass therethrough, and the bearing K may be supported bya plate or casting K, bolted to the face of the cheek-piece by bolts 70,as shown in Fig. 1.

By this construction it will be seen that the armature and fields areentirely inclosed by a magnetic armor, as it were, and the lines offorce find the best possible path between the poles, and by making thestructure rigid the armature may be run very close to the pole-pieceswithout danger, thereby securing a short air-gap, the resistance ofwhich is very slight as compared with machines of ordinary construction.

Having thus described my invention, what I claim as new is- I scribed.

In a consequent-pole induction-mach inc, the combination with the basehaving the cheek-pieces projecting upwardly therefrom of theoppositely-arranged movable fieldpieces clamped between the cheek-piecesand inelosing the space for the armature, the polepieces and coresprojecting from the bodies of said field-pieces, and the consequent-polepiece formed by a portion of each field-piece; substantially asdescribed.

a. In a consequent-pole in duction-machine, the combination with thebase having the check-pieces projecting upwardly therefrom and aconsequent-pole piece on the base, intermediatc the cheek-pieces, of theindependent field-pieces having the main and top consequentpole piecesthereon, clamped between the cheek-pieces and surrounding the armature,and the armature arranged transversely of the cheek pieces;substantially as described.

5. Ina consequent-pole induction-machine,

the combination with the base having the upward]y-projectingcheek-pieces, the polepiece located centrally between the cheekpieces,and the seats for the field-pieces at the ends of the check-pieces, ofthe independent field-pieces clamped between the cheek-pieces, seatingin said seats and having projections meeting at the center of themachine to form the upper pole-piece, the main pole-pieces projectingfrom the upright portions of the field-pieces, the coils surrounding thesame, and the armature journaled transversely of the cheek-pieces;substantially as described.

6. In a consequent-pole induction-machine, the combination with the basehaving the upwardly-extending cheek-pieces with a unature-openingsformed therein, the central pole-piece and the seats for thefield-pieces all in one casting, of the independent fieldpieces seatingin said seats and having overhanging portions meeting at the center toform the top consequent pole, the main polepieces projecting inward fromthe upright portions of the field-pieces, the coils surrounding saidpoles the armature journaled between said poles transversely of thecheekpieces and the bolts uniting the cheek-pieces and field-pieces atthe bottom and adapted to serve as trunnions on which the field-piecesmay be swung back; substantially as described.

WALTER K. FREEMAN.

Attcst:

ALEX. S. STEUART, A. M. KELLY.

